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Nathan Colosimo 9add9d782d Bound decoded sparse-array lengths (#3462 )

## Summary

- reject compact sparse arrays above the supported logical length at the
main devalue hydration boundary
- delegate accepted sparse-array construction to devalue
- cover both current binary payloads and legacy flattened payloads

## Why

Compact sparse-array encodings can represent a logical length that is
disproportionate to the stored payload. Applying one codec-level bound
keeps hydration predictable before downstream consumers process the
decoded value.

## Impact

Compact sparse arrays with logical lengths above 100,000 now fail
hydration with a `RangeError`. Other payloads are unchanged.

## Verification

- `pnpm --filter @workflow/core test` — 2,023 passed, 3 expected
failures
- `pnpm --filter @workflow/core typecheck`
- `pnpm --filter @workflow/core build`
- focused serialization suite — 154 passed
- direct root-argument, bound-step, and aggregate-error payload checks
- reuse, quality, and efficiency review

2026-08-11 13:27:12 -07:00